that is where lisa amin is live for us tonight. lisa? >> reporter: david lewis was shot and killed three months ago in a parking garage at 5:40 p.m. and today volunteers passed out the flyers, hoping they will jog someone's memory who was here that day who may have seen something. friends and family spent an hour inside the mall for about an hour talking about lewis. at the time he was shot, san mateo police said the murder was targeted and lewis was arguing with someone. after serving 25 search warrants and interviewing more than 100 people there are still no suspects. >> that is what makes cases like this the most difficult when you only have a suspect and a victim and you don't have a lot of witness information. >> i believe that someone seen something. they may be afraid to come forward. they may have thought wow, that was a -- i don't know. they may have left the mall without knowing what happened. we are in the mall because some people never even knew that day that a murder occurred right here. >> reporter: lewis founded free at la